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Related Party Transactions (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Equity ownership percentage of director of parent 10.00%    
Direct premiums written associated with Rue Insurance $ 1,725,393,000 $ 1,634,415,000 $ 1,657,142,000
Commissions paid to Rue Insurance 1,200,000 1,300,000 1,400,000
Premiums paid to Rue Insurance for insurance coverage 200,000 300,000 500,000
Human resource outsourcing contract revenues with Rue Insurance     77,000
Commissions paid to Rue Insurance related to human resource outsourcing contracts     10,000
Contributions to the Selective Group Foundation 400,000 400,000 400,000
Related Party Insurance Agency [Member]
      
Direct premiums written associated with Rue Insurance $ 7,800,000 $ 7,200,000 $ 7,600,000